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SubjectRe: [PATCH] i3c: svc: Annotate struct svc_i3c_xfer with __counted_by
On Fri, Sep 22, 2023 at 10:50:23AM -0700, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct svc_i3c_xfer.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> Cc: Conor Culhane <conor.culhane@silvaco.com>
> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Cc: linux-i3c@lists.infradead.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks
--
Gustavo

> ---
> drivers/i3c/master/svc-i3c-master.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index 8f8295acdadb..32eca2d6caf0 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -143,7 +143,7 @@ struct svc_i3c_xfer {
> int ret;
> unsigned int type;
> unsigned int ncmds;
> - struct svc_i3c_cmd cmds[];
> + struct svc_i3c_cmd cmds[] __counted_by(ncmds);
> };
>
> struct svc_i3c_regs_save {
> --
> 2.34.1
>
>

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